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- Adds a CompiledModule abstraction on top of Cuda run time compilation. - Adds a cache of run time compiled kernels. The cache returns a kernel immediately and leaves the kernel compiling in the background. The kernel's methods wait for the compilation to be ready. - tests that runtime API and driver API streams are interchangeable when running a dynamically generated kernel. - Add proper use of contexts, one per device. The contexts are needed because of using the driver API to handle run time compilation. - Add device properties to the Device* struct.
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Orri Erling
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Oct 10, 2024
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| /* | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| #include <fmt/format.h> | ||
| #include <gflags/gflags.h> | ||
| #include <nvrtc.h> | ||
| #include "velox/experimental/wave/common/Cuda.h" | ||
| #include "velox/experimental/wave/common/CudaUtil.cuh" | ||
| #include "velox/experimental/wave/common/Exception.h" | ||
|
|
||
| DEFINE_string( | ||
| wavegen_architecture, | ||
| "compute_80", | ||
| "--gpu-architecture flag for generated code"); | ||
|
|
||
| namespace facebook::velox::wave { | ||
|
|
||
| void nvrtcCheck(nvrtcResult result) { | ||
| if (result != NVRTC_SUCCESS) { | ||
| waveError(nvrtcGetErrorString(result)); | ||
| } | ||
| } | ||
|
|
||
| class CompiledModuleImpl : public CompiledModule { | ||
| public: | ||
| CompiledModuleImpl(CUmodule module, std::vector<CUfunction> kernels) | ||
| : module_(module), kernels_(std::move(kernels)) {} | ||
|
|
||
| ~CompiledModuleImpl() { | ||
| auto result = cuModuleUnload(module_); | ||
| if (result != CUDA_SUCCESS) { | ||
| LOG(ERROR) << "Error in unloading module " << result; | ||
| } | ||
| } | ||
|
|
||
| void launch( | ||
| int32_t kernelIdx, | ||
| int32_t numBlocks, | ||
| int32_t numThreads, | ||
| int32_t shared, | ||
| Stream* stream, | ||
| void** args) override; | ||
|
|
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| KernelInfo info(int32_t kernelIdx) override; | ||
|
|
||
| private: | ||
| CUmodule module_; | ||
| std::vector<CUfunction> kernels_; | ||
| }; | ||
|
|
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| std::shared_ptr<CompiledModule> CompiledModule::create(const KernelSpec& spec) { | ||
| nvrtcProgram prog; | ||
| nvrtcCreateProgram( | ||
| &prog, | ||
| spec.code.c_str(), // buffer | ||
| spec.filePath.c_str(), // name | ||
| spec.numHeaders, // numHeaders | ||
| spec.headers, // headers | ||
| spec.headerNames); // includeNames | ||
| for (auto& name : spec.entryPoints) { | ||
| nvrtcCheck(nvrtcAddNameExpression(prog, name.c_str())); | ||
| } | ||
| auto architecture = | ||
| fmt::format("--gpu-architecture={}", FLAGS_wavegen_architecture); | ||
| const char* opts[] = { | ||
| architecture.c_str(), | ||
| #ifndef NDEBUG | ||
| "-G" | ||
| #else | ||
| "-O3" | ||
| #endif | ||
| }; | ||
| auto compileResult = nvrtcCompileProgram( | ||
| prog, // prog | ||
| sizeof(opts) / sizeof(char*), // numOptions | ||
| opts); // options | ||
|
|
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| size_t logSize; | ||
|
|
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| nvrtcGetProgramLogSize(prog, &logSize); | ||
| std::string log; | ||
| log.resize(logSize); | ||
| nvrtcGetProgramLog(prog, log.data()); | ||
|
|
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| if (compileResult != NVRTC_SUCCESS) { | ||
| nvrtcDestroyProgram(&prog); | ||
| waveError(std::string("Cuda compilation error: ") + log); | ||
| } | ||
| // Obtain PTX from the program. | ||
| size_t ptxSize; | ||
| nvrtcCheck(nvrtcGetPTXSize(prog, &ptxSize)); | ||
| std::string ptx; | ||
| ptx.resize(ptxSize); | ||
| nvrtcCheck(nvrtcGetPTX(prog, ptx.data())); | ||
| std::vector<std::string> loweredNames; | ||
| for (auto& entry : spec.entryPoints) { | ||
| const char* temp; | ||
| nvrtcCheck(nvrtcGetLoweredName(prog, entry.c_str(), &temp)); | ||
| loweredNames.push_back(std::string(temp)); | ||
| } | ||
|
|
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| nvrtcDestroyProgram(&prog); | ||
|
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| CUmodule module; | ||
| CU_CHECK(cuModuleLoadDataEx(&module, ptx.data(), 0, 0, 0)); | ||
| std::vector<CUfunction> funcs; | ||
| for (auto& name : loweredNames) { | ||
| funcs.emplace_back(); | ||
| CU_CHECK(cuModuleGetFunction(&funcs.back(), module, name.c_str())); | ||
| } | ||
| return std::make_shared<CompiledModuleImpl>(module, std::move(funcs)); | ||
| } | ||
|
|
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| void CompiledModuleImpl::launch( | ||
| int32_t kernelIdx, | ||
| int32_t numBlocks, | ||
| int32_t numThreads, | ||
| int32_t shared, | ||
| Stream* stream, | ||
| void** args) { | ||
| auto result = cuLaunchKernel( | ||
| kernels_[kernelIdx], | ||
| numBlocks, | ||
| 1, | ||
| 1, // grid dim | ||
| numThreads, | ||
| 1, | ||
| 1, // block dim | ||
| shared, | ||
| reinterpret_cast<CUstream>(stream->stream()->stream), | ||
| args, | ||
| 0); | ||
| CU_CHECK(result); | ||
| }; | ||
|
|
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| KernelInfo CompiledModuleImpl::info(int32_t kernelIdx) { | ||
| KernelInfo info; | ||
| auto f = kernels_[kernelIdx]; | ||
| cuFuncGetAttribute(&info.numRegs, CU_FUNC_ATTRIBUTE_NUM_REGS, f); | ||
| cuFuncGetAttribute( | ||
| &info.sharedMemory, CU_FUNC_ATTRIBUTE_SHARED_SIZE_BYTES, f); | ||
| cuFuncGetAttribute( | ||
| &info.maxThreadsPerBlock, CU_FUNC_ATTRIBUTE_MAX_THREADS_PER_BLOCK, f); | ||
| int32_t max; | ||
| cuOccupancyMaxActiveBlocksPerMultiprocessor(&max, f, 256, 0); | ||
| info.maxOccupancy0 = max; | ||
| cuOccupancyMaxActiveBlocksPerMultiprocessor(&max, f, 256, 256 * 32); | ||
| info.maxOccupancy32 = max; | ||
| return info; | ||
| } | ||
|
|
||
| } // namespace facebook::velox::wave |
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